The berofix box is a powerful and flexible hardware solution to connect ISDN (BRI, PRI) and GSM lines to any SIP based VoIP system. The berofix box is the external aternative to the cards. Due to the modular concept you can mix PRI, BRI and GSM ports on one card with full below described features which makes the berofix cards very unique. The berofix Boxes supports the following hardware DSP based Voice-Processing features: Features: